package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取请求路径
        String uri = request.getServletPath();
        //2.判断请求路径是否为登录路径，如果是登录路径，则放行
        if (uri.equals("/login")){
            log.info("登录请求：{}，放行", uri);
            //放行
            filterChain.doFilter(request,response);
            return;
        }
        //3.获取请求头token
        String jwt = request.getHeader("token");
        //4.判断token是否为空，为空则返回401
        if (jwt == null || jwt.isEmpty()){
            log.info("请求头token不存在！");
            response.setStatus(401);
            return;
        }

        //5.解析令牌，如果解析令牌错误，则返回401
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        } catch (Exception e) {
            log.info("令牌解析错误！");
            response.setStatus(401);
            return;
        }
        //6.放行
        log.info("放行");
        filterChain.doFilter(request,response);
        log.info("当前用户id,从ThreadLocal移除");
        CurrentUserHoler.removeCurrentUser();
    }
}
